Telephone system



sept. 25, 194s.

c. E. LoMAx VE1' AL 2,385,715

TELEPHONE 'SYSTEM v Filed Oct. 9, 1941 19Y Sheets-Sheet 1 To Gaf oin/ Con/7. 6'@ M@ f ATTORNEYS' Sept. 25, 1945.

c. E. LoMAx ETAL TELEPHONE SYSTEM I Filed om. 9, 194'1' i9 Shee'os-Sheerf;

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v oRs max INV Clarence E. BY af Y pLlvBClk a' Attorneys,

' CZQQLA czee Sept 25,1945'l c. E. LoMAx ETAL- 2,385,715 TELEPHONE SYSTEM Filed oet. 9. 1941 19 sheets-sheet 4 Ff 3H Feed5 lNvENToRs Sept. 25, 1945.

A Filed oct. 9, 194i C. E. LoMAx E TAL TELEPHONE 'SYSTEM 19 Sheets-Sheet l5 y C290 L C388) C29/7 3 l Y* C29/7 C2927 366 M H" C292 -A C3897 ,C2397 AL332 w 302 v [wi/@i303 367 2337 C233) 0295) 34405 i l"iii/370 C296-7 Y Q3/2 .1 T L3/3 ,C293 l C299, C237' C237, 6228 C2237 INVENTORS Clare/1G35 Lomax Y Pwr' Bakker BY 1 g n 1 ATTORNEYS 99111.25, 1945'. 1 l C', E, LOMAX ETAL 2,385,115

` TELEPHONE SYSTEM v Filed oct. 9, 1941 19 sheets-sheet 6 f g i Conncfof' 20 412// www zz/ I lNvENToRS Clare/ 70e E Lomax BYPzer Bak/er Mam?. m1/Mm;

ATTORNEYS Sept. 25, 1945.

C38 4H x C. E. LOMAX ETAL TELEPHONE SYSTEM Filed Oc;t l 9, 1941 19 Sheets-Shea?l '7 ATTORNEYS Sept 25, 1945- c. E. LoMAx ETAL I 2,385,715y

TELEPHONE SYSTEM Filed Oct. 9, 1941 19 Sheets-Sheet 9 Conf/'0I 548 C5977 C524, A f C624,

C228/ 54V* INV 09157 Clarence E maL BY Pla/ Bak er' Sept. 25, 1945. c. E. LoMAx ETAL 2,385,715

' TELEPHONE SYSTEM A 1 Y I L Filed Oct. 9', 1941 19 Sheets-Sheet 11 cz 'vm arance maa; BY Y Plek Bak/fer spn 25,1945.'

C. E. LOMAX ET AL TELEPHONE SYSTEM SPt 25 1945 c. E. LoMAx ETAL l 2,385,715

TELEPHONE SYSTEM Fild Oct. 9, 1941 19 Sheets-Sheebl INVENTORS Carence E Loma@ Dier Bakker ATTORNEYS Sept. 25, 1945. c. `E, LoMAx ET-AL 2,385,715

' TELEPHONE SYSTEM l Filed on. 9, 1941 19 sheets-sheet v15 INVENTORS Clarence E Lomafr ATTORNEYS Se'pt. 25, 1945.- c. E.v LOMAx ETAL v v 2,385,715

. TELEPHONE SYSTEM Filedv Oct. 9, 1'941 19 Sheets-Sheet 16 fle-ff l -.l0 Seconds L l v 4/2/ /sec A [4]' ATTORNEYS sept' 25, 1945 C. E. L oMAx ETAL 2,385,715

' TELEPHONE SYSTEM l l Filed 0eme, 1941 19 sheets-sheet 18 [362 Conral" Crc'uiz120.5 I Fig Y 'l' `ATroRNlaafs Patented 1945 TELEPHONE SYSTEM clarence E. Lomax and Pier Bakker, chicago, nl., aaslgnors to Automatic Electric Laboratories, Inc., a corporation of Delaware n `Application October 9, 1941, Serial No. 414,2!52` 34 claims.

The present invention relates to telephone systems and, more particularly, to improvements in power supply and supervisory equipment of the character used in small, unattended automatic exchanges.

It is an object of the present invention to provide improved equipment of the character described, which utilizes a single interrupter to provide all of the timing pulses, code ringing imy pulses and supervisory signaling pulses that are required in the operation of a small, unattended automatic exchange. According to another object of the invention, the code forming cams of the interrupter, together with the pickup pulse cams and the cam for defining the code cycles, are all carried by a single shaft which is readily detachable from the interrupter without disturbing the other parts thereof, in order to permit the 'code combinations to be changed at will.

It is another object of the invention to pro.. vide in a telephone system of the character described a combined ringing interrupter and timing device which is arranged to control in a single and reliable manner the conversation timing facilities of the line switching equipment, the release of the line switching equipment utilized in setting up reverting call connections, and the charging equipment for the exchange battery.

It' is a further object ofthe invention to provide in a telephone exchange of the character indicated, an improved and exceedingly simple supervisory signaling arrangement for transmitting to an operator position in a distant ofce a supervisory signal which may be automatically altered in accordance with the condition of different pieces of the exchange switching equipment to indicate the presence of any one of a large number of speciiic abnormal conditions to which this equipment maybe subject.

In accordance with another object of the invention the abnormal conditions which may occur in the system are set up in a register as they arise, and the register effects corresponding changes in the supervisorysignaling circuit to altergthe transmitted supervisory signal so that the registered labnormal condition or conditions may be identified.

. olce a. predetermined interrupted signal which includes a signal period for each abnormal condition that may arise in the associated equipously transmitted.

' cities.

ment. and provisions are made tor-automatically masking out of the signal any signal period which corresponds to an abnormal condition that is actually present in the associated equipment. l

Inl accordance with still another object ct the invention, provisions are made for automatically transmitting a marking signalto separate each transmitted supervisory signal from that previ- According to a still further object of the invention, the marking and supervisory signals are derived from diierentv signal current generators provided in the exchange.

It is a still further object of the invention to .provide in conjunction with improved supervisory,"

signaling equipment of the character described, improved alarm sending apparatus which is so arranged that an alarm signal designating one abnormal condition may be transmitted to the distant oilice immediately after a rst alarm signal has been transmitted and before the fault responsible .for the ilrst transmitted signal is cleared.

The invention, both as to its organization and method of operation, together with further objects and advantages thereof, will best be understood by reference to the speciflcation'taken in connection with the accompanying drawings in which Figs. 1,.2A and 2B, 3A and 3B, 4A and 4B, 5A and 5B, 6A and 6B, 'I and 8 to 13, inclusive. when combined in the manner shown in Fig. 15

illustrate an automatic telephone system having embodied therein the features of the invention as briefly outlined above, and Fig. 14 illustrates in schematic form the arrangement of the interrupter forming a parto! the power supply andsupervisory signaling equipment included in the system.

Referring now more particularly to the draw. ings, the telephone lines, automatic switching apparatus and power supply and supervisory signaling equipment there illustrated may comprise, for example, a small, unattended automatic exchange designed to serve a suburban area vol limited population which is geographically adjacent several larger cities or towns, each of which is served by a central exchange. Interoffice trunss are used to provide communication facilities between the small community exchange and the oiilces provided in the adjacent larger For example, the automatic switching equipment of the community exchange is illustrated as having access to `the automatic exchange 9 over a group of trunks which includes the trunk I3. Similarly, groups of trunks are 

